Rod Antennas

Description:

The active monopole antenna VAMP 9243 consists of a vertical rod and an impedance matching amplifier. The rod has a standard length of 1m (other rod length on request) and can be considered as short compared to the wave length in the frequency range 9 kHz-30MHz.

The conversion factor is independent of the frequency because of the extremely high impedance of the matching amplifier.

The circuit gives best results of noise and intermodulation for a conversion factor (antenna factor) of +10 dB and sensitive measuring receivers are able to use the whole dynamic range of the antenna.

For very high field strength, an optional plug-in attenuator reduces the amplification by 20 db.

In order to avoid absolutely any influence by the mains, power supply, voltage regulator a. o., the VAMP 9243 has built-in NiMH rechargeable batteries. The typical operation time is at least 50 hours.

Applications：

● 10khz-30mhz electric field measurement for CISPR 25 of automotive electronics

● 10khz-30mhz electric field measurement of re102 for mil-std-461e

● It is required that the test be carried out in the shielding room. If it is in a dry air environment, it can also be measured outdoors.

Specification：

● Frequency range: 9 kHz - 30 MHz

● Conversion factor ("Antenna factor"): +10 dB/m+-1.5 dB

● Upper limit of field strength measurement: 1 V/m (F=1 MHz, 1 dB

compression)Input attenuator for higher field strength optional

● Lower limit of field strength measurement: Limitation by internal noise.

   ◆ Typ. - 3 dBμV/m / 10 MHz, CISPR-Quasi peak, 9 kHz bandwidth

   ◆ Typ. -8 dBμV/m / 10 MHz, Average detector, 9 kHz bandwidth

   ◆ More information is given datasheet

● Output of the monopole amplifier: BNC-connector, fem., 50 Ω.

● Power supply: 9,6 V /1100 mAh NiMH

● Dimensions and weight:

   ◆ Monopole (Rod): Length including thread connection 1m, Weight approx. 0,2 kg

   ◆ Amplifier: 180x80x40 mm (WxHxD)without BNC-connector(female) and controls. Top plate 220x120 mm, Weight approx. 0,7 kg

● 2.8 Construction of the monopole (Rod): Aluminium rod 16 mm diameter with thread-hole M8

● Construction of the amplifier: Cabinet made of aluminium profiles. Top plate 3 mm aluminium material.

● Threads for tripods: 1/4", 3/8"

● VAMP 9243 Calibration Device CA 9243

   ◆ The CA 9243 consists of a matched resistive 6dB voltage divider and a pull rod analog capacitor, which is used for calibration and function test of the VAMP 9243 pull rod antenna. The CA 9243 adapter can also be used to calibrate the VAMP 9243 option VT 9243-20db or vt 9243-10db.